Improvement in lock-spindles



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"JOSEPH L. HALL, or 'oLNorNNArLC oHro.

Letters Patent. Nc. 105,800, daad .my 26,1870.

IMPROvEMeN'r IN Loox-SPINDLES.

The Schedule referred to in these Letters Patent and making partrof the same.

I I, JOSEPH L. HALL, of ,Oincinnat`i, in 'the county of Hamilton and State of Ohio, have invented certain Improvements in Arboris for Operating Locks, of

. which the `following `is aspecfication.`

My invention relates to an improved .construction otarbors, and manner of securing them in thedoors, casrngs, or-bodiesofsafes, and consists in constructing the arbors' with core-pieces'of drill-proof -r'netal,`,

which are driven, riveted, keyed, screwed, or rnstedin the longitudinal perforations 'made'inthe axes and through, or any desiredlengtli ofthe arbors','from their exterior toward their interiortends', p for the purpose of pr'eveutingthe drilling `of the arborsLtheirremoval and subsequent forcing -oi' the locks, thereby .expos-V ing the contents ofthe safe, or otherwise-.secure receptacles. i

Figure l is a longitudinal section and plan of the exterior end of an` arbor embodying my invention.

Figures 2 and 4 are modifications of the same. `l1`ignre 3 is a longitudinal section of an arbor, locknut, ring, and a portion of the safe-door, and also a transverse sectional elevation of the same.

A is the arbor; itis made of steel, or steel and ironl welded together, that it can be made drill-proof;`its large end a is cylindrical for a short part'of the length,

` as exhibited in rigs. 1 and 3, or flanged, as shown in i iigs. 2 and 4.

From the cylindrical end a to near the small and rnncr end b the `arbor has a taper, more or less, ac-` cording to its location.

j B is .the eorefpiece, located inthe central and axial perforation 0,'in the arbor. f

'lhc diameter of this perforation is equal to about one-third lof the diameter' of the smallend b of the i arbor; in length the perforation may be nearly that of the arbor.

vThe core-piece B after bein tempered to resist the` hardest tempered tools used in iron or steel working, is either' screwed; keyed, riveted, rnsted, or' driven into the perforation O in the arbor, so that it cannot be re- Irr iig. 3 is exhibited a device for` preventing thereuroval of the arbor, either by forcing it in or drawing it ont, when a sufcient purchase has been obtained upon it by tapering into its exterior end, and applying force to accomplish that purpose'.- l

Au annular gutter or groove, c, is formed in the large end a of the arbor; in this groove is fitted the two halves of the ringD; the miteredface d of this halved ring is presentedtoward the interior of the safe, and isv not above the conical' surface of the arbor.

The lock-nut E, passes freely about the arborin the recess e, formed in ,the door of the safe, until its face f engages the corresponding face on the halved ring D and confines the said ring in its groove in the arbor, thus makingV it so that it can be readilyremoved from the inside of `the door when the door is opened. y

' Since the ring D, in the groove of the arbor, is `in contact on its iront face with the one or more thicknessesof metallic plates, and its miter face is in contact with the nut E, which is screwed into the recess edges of the interior plates of the,- door of the safe,

the arbor is firmly locked in place.

It has been found to be ditlicnlt, if not impossible,

to impart the requisite degree' of toughness tothe inner 0r central particle of the steel arbors, that their surfaces acquire inthe process of tempering, to successi'nlly resist the drill which is used to remove the tral parts of arbors, -for operating locks for the purpose of preventing drillingthrough the center of saidarbor's, when the same are used upon burglar-proof safes or other secure receptacles, substantially in the mannerherein shown and described.

2. 'lhe arbor orl spindle A, provided with va. recess or shoulder, and having a split-ring D, tted therein, and held in place by a'nut, E, t'or'the purpose' offastening the arbor in its seat,substantially, asdescrilied.

JOSEPH L. HALL.

Witnesses:

G. L..FIsHER, i H. Guess. 

